Typewriting machine



NOV. 16, 1937. UTZ

TYFEWRITIING MACHINE Original Filed May 1, 1936 A rzZ hang [1&2

Patented Nov. 16, 1937 TYPEWRITING MACHINE Anthony Utz, Hartford, Conn.,assignor to Royal. Typewriter Company, Inc., New York, N. Y., acorporation of New York Original application May '1, 1936, Serial No.77,420. Divided and this application August 27, 1936, Serial No. 98,233

3 Claims.

quiet escapement action is produced during the step by step feedingmovement of the carriage.

With this and other objects in view which will more fully appear, thenature of the invention will be more clearly understood by following thedescription, the appended claims, and the several views illustrated inthe accompanying drawing.

In the drawing:

Figure 1 is a rear elevation, partly in section, of an escapementmechanism constructed inv accordance with my invention.

Figure 2 is an enlarged section taken on the line 2-2 of Figure 1, and

Figure 3 is a perspective view of the flexible stop for the pivotedpawl.

In the accompanying drawing, 5 indicates the usual rack which isattached to the carriage, and supported on the main frame of the machinebelow the rack is a frame A for supporting the escapement mechanism. Theframe A includes two spaced horizontal arms 6, 6 and an upwardlyextending vertical arm I. Journaled in the vertical arm I is a shaft 8on which is rotatable a pinion 9 having teeth It] for engaging the rack5. Fixed to the shaft 8 is an escapement wheel I I having teeth 12. Aback dog I3 for the pinion 9 is pivoted as at l3 to the escapement wheelH.

The escapement wheel ll is intermittently released during the step bystep feeding movement of the carriage by the following noise-reducingmechanism: Pivoted on the horizontal arms 6, 6 of the escapementsupporting frame A as at 23, 23 is a dog rocker C which carries a fixeddog 24 and a pivoted or limber dog 25 which intermittently engage theteeth l2 of the escapement wheel in the usual manner whenever the dogrocker C is rocked by the key levers.

A flexible stop arm D for the pivoted dog 25 is preferably formed fromflat spring steel, and includes an attaching bracket 26 which ispositioned against the front face of the rocker C and is secured theretoby rivets 21, the stop arm being disposed in rear of the rocker andextending upwardly from and at right angles to the bracket 26. The upperend of the flexible stop arm D is bent laterally towards the pivoted dog25 to form an ear 28. A metal block 29 is positioned against the underface of the ear 28 and is secured to said ear by a rivet 30. The block29 is in loose contact with the arm D as indicated at 3| in Figure 1,and is formed with'a horizontal threaded opening 32 for adjustablyreceiving a stop screw 33, said screw extending into the opening 32through an alined opening 34 formed in the arm D. The diameter of theopening 34 is slightly greater than the diameter of the stop screw, andthis functions to permit the block 29 and the stop screw 33 to receivethe impact of the pivoted dog 25, transmitting the sound waves directlyto the stop D.

The rocker C is provided with a limiting ear 35 which is located on thatside of the flexible stop arm D opposite the pivoted dog 25. This car 35is spaced from the arm D a distance sufficient under normal operatingconditions to avoid being contacted by said arm. Should, however, anaccidental heavy thrust be imparted to the arm, any undue flexingthereof will be prevented by its contacting said ear.

A coil spring 36 which has one end connected to the pivoted dog 25 andthe other end anchored to the rocker C, functions to yieldingly urge thedog away from the stop screw 33 and against a sound deadening stop 31mounted on the rocker.

In operation, assuming the parts to be in their normal positions, asviewed in Figure 1, the rocker C is rocked upon depression of a keylever and the pivoted dog 25 is thereby released from the tooth of theescapement wheel. The escapement Wheel is then rotated by the carriagespring until said released tooth engages the fixed dog 24, andsimultaneously the pivoted dog 25 is swung against the stop 3! by meansof the spring 36. The rocker C is then returned to its initial positionby the usual return spring, and the pivoted dog is thereby carried intothe path of. the next tooth of the escapement wheel, the latter beingfree to turn the pivoted dog 25 to its normal or starting positionagainst the stop screw 33. The impact of the pivoted dog against thestop screw 33 will cause the stop arm D to flex and thereby reduce thenoise of impact which would otherwise occur if the arm were rigid.

It is of course to be understood that the details of structure andarrangement of parts may be variously changed and modified withoutdeparting from the spirit and scope of my invention.

I claim:

1. In a typewriter or like machine, an escapement mechanism including anescapement wheel,

a dog rocker, a fixed dog and a movable dog mounted on the rocker andalternately movable into engagement with the teeth of the wheel, aflexible stop arm for the movable dog mounted on the rocker, and anadjustable stop mounted on said arm for direct contact with said movabledog.

2. In a typewriter or like machine, an escapement mechanism including anescapement wheel, a dog rocker, a fixed dog and a movable dog mounted onthe rocker and alternately movable into engagement with the teeth of thewheel, a flexible stop arm for the movable dog mounted on the rocker,the upper end of the arm terminating in an offset ear, a block fixed tosaid ear and provided with a threaded opening, and a stop screw mountedin said threaded opening for direct contact with said movable dog.

3. In a typewriter or like machine, an escapement mechanism including anescapement wheel, a dog rocker, a fixed dog and a movable dog mounted onthe rocker and alternately movable into engagement with the teeth of thewheel, a flexible stop arm for the movable dog mounted on the rocker, anadjustable stop mounted on said arm for direct contact with said movabledog, and a limiting stop for the flexible arm fixed to the rocker anddisposed on that side of the arm opposite the movable dog and normallyspaced from said arm.

7 ANTHONY UTZ.

